add

Author: JackieHoo

242.md

@@ -0,0 +1,23 @@
+# Valid Anagram
+### 解法一
+```go
+//使用一个辅助哈希表的方式
+func isAnagram(s string, t string) bool {
+    result := make(map[rune]int) // 设置一个储存数据。
+
+    for _,v := range s {
+        result[v]++
+    }
+    for _,v := range t {
+        result[v]--
+
+    }
+
+    for _,v := range result {
+        if v != 0 {
+            return false
+        }
+    }
+    return true
+}
+```

README.md

@@ -5,6 +5,7 @@ All leetcode questions that solved in different methods.
 |question number|URL|type|result|
 |:---:|:---:|:---:|:---:|
 |[240](./240.md)|[Search a 2D Matrix II](https://leetcode-cn.com/problems/search-a-2d-matrix-ii/description/)|array|👌|
+|[242](./242.md)|[Valid Anagram](https://leetcode-cn.com/problems/valid-anagram/description/)|string|👌|
 |[283](./283.md)|[Move Zeroes](https://leetcode-cn.com/problems/move-zeroes/description/)|array|👌|
 |[287](./287.md)|[Find the Duplicate Number](https://leetcode-cn.com/problems/find-the-duplicate-number/description/)|array|👌|
 |[378](./378.md)|[Kth Smallest Element in a Sorted Matrix](https://leetcode-cn.com/problems/kth-smallest-element-in-a-sorted-matrix/description/)|array|👌|